Environmental Effects Of Air Pollution

956 Words4 Pages
Increase in fossil fuel combustion has altered atmospheric composition over last century and more so in urban areas where air quality has generally deteriorated. Pollutants, like ozone (O3), carbon monoxide (CO), nitrogen oxides (NOx), sulphur dioxide (SO2), heavy metals, volatile organic compounds (VOCs) and particulate matter (PM2.5 and PM10) have varied composition, properties, emission rates, degeneration time and diffusion potential. Urban trees being near to the emission sources have a positive effect on local air quality. Trees when properly selected and managed, have potential to improve quality of urban air (Nowak, 2000). Oxygen production is the most commonly cited benefit of trees but Nowak et al. (2007) opined that considering the large amount of oxygen in atmosphere, this benefit seemed trivial. Urban trees have numerous other environmental as well as health benefits which outweigh oxygen generation and air pollution mitigation was amongst the most significant contributions. Air pollution affects many systems and has serious effects on human health. Exposure to pollutants over short and long durations has been associated with premature deaths and shorter life span (Kampa and Castanas, 2008). One or more respiratory problems affected 33.2 per cent of Delhi residents in comparison to 19.6 per cent of control group. Reduction in function of lungs was observed in 40.3 per cent people as compared to 20.1 per cent in control subjects. 3.9 per cent of Delhi residents
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